I use either BP Ultimate or Mobil Synergy 8000, mostly the BP because it is easier to get. I have found that Shell Optimax is not as consistant as the other two. Sometimes it is good, others the car pings its head off when using it.
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Just a note, Caltex Vortex is only 95RON, lower than the 98RON of Ultimate and Optimax. It's more of a detergent fuel that cleans the engine, or that's what they claim anyway.
The truth behind octane ratings is to use the lowest RON that won't make your engine ping - anything more is useless and a waste of money. Using a higher octane rating isn't going to magically make your car go faster, futhermore, it's not a 'treat' for your engine.
All this amounts to is a smart marketing ploy by the fuel companies to grab more of our money - aren't we paying enough already? Any additional benefits that you may see in using it in a low compression engine (like increased fuel economy, smoother running) are purely psychological.
On the other hand, if you are running an older engine, or a high compression or boosted engine, use the higher octane fuel or risk detonation and engine failure.
I actually have switched to Mobil Synergy, away from Optimax, as the Optimax seems to leave a film and residue across the back of the car, which even detergent struggles to remove.
A freind of mine, who was using it in his drag boat reported the same thing.
In addition, the quality of Optimax seemed to go up and down, it wasnt consistent. However, Synergy seems to do the trick. No complaints
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